Started up from Radio Road at the Summit Loop north trailhead where a small lizard crossed the trail ahead of me, stopping briefly to pose for a pic (first foto).

From the summit towers area headed to the east end of the road where there's an auto barrier and trailhead for the Ridge Trail (next three pics). However, this time trail access was barred to hikers due to some kind of PG&E work. So back down the way I came up on the Summit Loop north (last five pix), shortly connecting with the Dairy Ravine and Eucalyptus Loop Trails, looping back to where I started.

Through the Meadow and back onto the Bog Trail, a small black-and-white snake was in the middle of the trail. He was in the process of eating a tiny bug.

On any of the Bog Trail's several benches, it's difficult to get back up: few people, no nasty smells, (mostly) warm sun, gentle breezes, birdsong, bees and butterflies.

Hi,
I came across your blog while researching local (bay area) snakes. Your mentioning of a small black and white snake piqued my interest. It sounds like it could be a California Kingsnake, common in parts of the bay area, but not encountered or recorded on San Bruno Mtn. I photograph local snakes as a hobby and would love to confirm what species you saw. Please email me if you're interested in positively IDing the snake. I would love to observe one and submit a record for this locale.
Thanks,
Luke-

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I like meandering around on San Francisco's park trails and public stairways, sometimes taking photos, and enjoying nature and the outdoors.